ON SOUTH-AMERICAN APOCYNACEA. 99 
geminate, or axillary, 3 in. long, pubescent, bare at the base for 2 in., oppositely branched 
at intervals of 9 lines, branchlets 9 lines long, again divided aboye the middle, bearing 
above several lax flowers on bracteolated pedicels } line long; sepals acute, pilose, 
margins membranaceous, 2 line long; corolla 14 line long; segments ovate, as long as 
the tube, sublanate within, with dextrorse sestivation ; stamens subincluded. 
14. TuvnsaxTHUS cracruis, Benth. Hook. Journ. Bot. iii. p. 246; A. DC. l c. p. 387. ` Tn Guiana Brit. 
ad Curassawaka : v. s. in herb. meo (Schomburgk 608). 
A species near the preceding, with verrucously lenticellate branches 2} lines thick, 
and very slender horizontal branchlets with axils 2-3 in. apart; leaves oblong-ovate, 
rounded and subcordate at the base, suddenly narrowed towards the summit into a 
narrow obtuse acumen, submembranaceous, glabrous, opake green above, sulcate along 
the midrib and fine diverging nerves, reticulately veined, with 2 minute glands at the 
base of the midrib, ferruginously opake beneath, with scarcely prominulent nerves, 
3-3) in. long, 13-1} in. broad, on slender spreading petioles 2 lines long; panicle ter- 
minal, 4-53 in. long, subthyrsoid, very laxly and remotely branching from the base, 
branches diverging, 24 in. long, diminishing upwards, very glabrous, again alternately 
divided, the branchlets bearing many lax or subfasciculated flowers, on bracteolated 
pedicels 1 line long; flowers very small, like those of the preceding species. 
15. THYRSANTHUS POPULIFOLIUS, nob.: Tabernemontana populifolia, Poir. Dict. Suppl. i. p. 276; A. DC. 
l. c. p. 374. In Carolina et Georgia: v. s. in herb. Mus. Brit. Georgia (Marshal). 
A species with slender dichotomous branches. Its leaves are broadly ovate, subacute 
at the base, shortly acuminate, subchartaceous, almost glabrous above, pale and opake 
beneath, shortly and rigidly pilose, 13 in. long, 1} in. broad, on petioles scarcely 1 line 
long; panicles axillary, 25 in. long, on a peduncle bare for 1} in., branching above, 
branches 6-9 lines long, again shortly branched, and bearing numerous small flowers on 
pedicels 2 lines long; sepals lanceolate, subrecurved, 1 line long, with several very 
minute inner scales; corolla glabrous; tube contracted in the middle, 14 line long; seg- : 
ments oblong ovate, 14 line long, with dextrorse convolution; stamens almost wholly 
included within the tube; anthers cuspidate, with 2 long acute basal prongs; style, 
stigma, and disk as in the generic character. 
16. THYRSANTHUS DIFFORMIS, nob.: Echites difformis, Walth. Fl. Carol.; Pursh, Fl. Un. St. i. 178; Ellis, 
Sk. i. 312: Echites puberula, Mich. Fl. Bor. Amer. i. 120; Poir. Dict. Suppl. ii. 537 : Forsteronia 
difformis, A. DC. l. c. p. 437: Secondatia difformis, Benth. & Hook. Gen. ii. 710. In Carolina et 
Florida: v. s. in herb. Mus. Brit. Florida (Chapman). S 
A slender climbing species, with pubescent branches; leaves lanceolate elliptic, acute 
at the base; acuminate, membranaceous, pale green above, opake, obsoletely puberu- 
lous, with slender immersed pellucid nerves and reticulated veins, with a granular 
yellow gland at the base of the midrib, very pellucid, opake beneath, puberulous on the 
midrib and nerves, 11-3 in. long, 6-12 lines broad, on channelled petioles 2 lines long; 
panicles axillary, glabrous, 24 in. long; peduncle slender, bare at the base for 1 in., 
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